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VLA observations at 333 MHz: A Search for pancakes

Published online by Cambridge University Press:  12 April 2016

Juan M. Uson ,
Durgadas S. Bagri  and
T. J. Cornwell
Juan M. Uson
Affiliation:
National Radio Astronomy Observatory, P.O. Box. 0, Socorro, NM 87801
Durgadas S. Bagri
Affiliation:
National Radio Astronomy Observatory, P.O. Box. 0, Socorro, NM 87801
T. J. Cornwell
Affiliation:
National Radio Astronomy Observatory, P.O. Box. 0, Socorro, NM 87801

Abstract

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The P-band is the most recently completed observing band at the VLA. The aperture efficiency of the antennas is 0.4 and the system temperature is ∼ 130 K. The primary beam is slightly off-axis and its half-power width is steeply frequency dependent, which induces abnormal spectral indices on off-axis (≥ 1°) sources. We have searched for Zel’dovich “pancakes” and reached a level of ΔSrms ∼ 3.5 mJy for spectral channels of width Δν ∼ 100 kHz. We find no pancake with MHI ≳5 × 1014 M⊙.

Type
Imaging
Information
International Astronomical Union Colloquium , Volume 131: Radio Interferometry: Theory, Techniques, and Applications , 1991 , pp. 223 - 227
Copyright
Copyright © Astronomical Society of the Pacific 1991

References

Cornwell, T.J. and Perley, R.A. (1990), in “Digital Image Synthesis and Inverse Optics”, Arthur F., Gmitro, Paul S., Idell, Ivan J., LaHaie, Eds., Proc. SPIE 1351, p706.Google Scholar
Sunyaev, R.A. & Zel’dovich, Ya.B. 1975, M.N.R.A.S., 171, 375.CrossRefGoogle Scholar
Zel’dovich, Ya.B. 1970, Astr. Ap., 5, 84.Google Scholar